Thread cutter for sewing machines



1,62 2 Apnl 1927' s. CORTESE 63 9 THREAD CUTTER FOR SEWING MACHINES Filed June 3. 1926 Fig 9.4

nozvdo'z AS Corene Z 2 f Z Z V 7 Quorum Patented Apr. 26, 1927.

UNITED STATES SAM CORTESE, F DUNSM'UIR, CALIFORNIA.

THREAD CUTTER FOR SEWING MACHINES.

Application filed June 3, 1926. Serial No. 113,507.

This invention is an attachment for shoescwing machines and has for its object the provision of simple, inexpensive and ethcient means whereby the thread may be easily and rapidly cut after the sewing operation has been completed. The invention provides a thread cutter which may be applied to the shuttle arm of a sewing machine without requiring any substantial structural change in the arm and without modifying the operation of the working parts of the sewing machine in any manner. The invention is illustrated in the accompanying drawing and will be hereinafter fully setforth.

In the drawing:

Figure l is a perspective view of a portion of a shoe-sewing machine having my improved thread cutter applied thereto;

Fig. 2 is a bottom plan view of the attachment;

Fig. 3 is an enlarged perspective view showing one end of the plate;

Fig. 4 is an enlarged central longitudinal section of the plate.

In the drawing, the reference numeral 1 indicates the arm of the sewing machine in which the shuttle and bobbin are mounted and operate, 2 designates the needle and 3 the presser foot, these parts being shown in a more or less conventional manner and being of the usual construction and arrange ment. In carrying out my invention, I provide a plate 4 which is narrow and of such length that it will fit upon the arm 1 adj acent the end thereofwithout projecting excessively beyond the sides of the arm. The plate is provided at its center with an opening 5 through which an attaching screw 6 may be inserted into the arm whereby to secure the plate in place and permit it to be readily turned so that either end may be disposed over the shuttle as may be desired. The ends of the plate are substantially arcuate, as indicated at 7, and adjacent each end is an opening 8 which provides for the passage of the needle 2 in the operation of sewing. Near each end there is also provided a second opening 9 through which a stud 01 pin, indicated at 10, may be inserted into a socket provided therefor in the arm 1 whereby the plate will be held against turning when in use. It will be understood that the stud or pin 10 is inserted through that opening 9 which, in

either position of the plate, is at the inner end thereof. On the under side of the plate 4 are formed grooves 11 which accommodate the shuttle and permit the plate to be so; down over the shuttle so that the needle will cooperate therewith in the same manner and with the same efliciency as if the attachment were not provided. At one end tho plate 4 is cut away or reduced, as shown at 12. to provide an overhanging flange or lip 13 and in the said lip is a slit or notch 14, the walls of which are sharpened to produce cutting edges whereby, if the thread be engaged in the said slit or notch, it will be readily severed. At the opposite end of the plate, there is also provided a cutter, and this cutter is in the form of a somewhat resilient curved tongue 15 extending around the end of the plate within a recess 16 formed therein to accommodate the tongue, the tongue being secured at one end upon the edge of the plate, as shown at 17. It will be readily noted upon reference to Figs. 1 and 3 that the end of the tongue is free of the plate, althou h the tongue fits closely to the arcuate edge of the plate and a thread may be easily engaged between the tongue and the plate and drawn under the tongue so as to be out. it being particularly noted, more especially upon reference to Fig. &, that the lower edge of the tongue is beveled or otherwise formed into a cutting edge.

The ends of the plate define arcs of dif ferent diameters so that either end may be disposed over the shuttle accordingly as the shoe being sewed is larger or smaller. The shoe is sewed in the usual manner and, when the sewing is completed, the presser foot is raised in the customary manner and the shoe withdrawn from the arm 1 and, at the same time, given a slight lateral movement so that the thread will be carried into the slit or notch 14 or against the tongue 15, as the case may be, and thereby severed. The cut of the thread will be close to the shoe and a suflicient length of thread will be left to be easily engaged when another shoe is to be sewed but there will be no waste of thread nor loss of stitches nor breaking of the thread as is now a frequent occurrence. The attachment eliminates the use of a separate knife for cutting the threads which knife is frequently displaced or lost. Consequently, there is no time Mil Wasted in searching for 10st tools when the Workman is employed at 21 machine equipped with my attachment.

Having thus described the invention, 1 claim:

1. A thread-cutting" attachment for sewing" machines comprising atplnvte provided adjacent its ends with needle openings, means for pivoting the said plate upon the shuttle arm of a sewing machine, means to be engaged with one end of the plate and the shuttle {1TH}. of the sewing machine to prevent mevement of the plate, and knives at the ends of the plate dispee-ied transversely thereof.

A. threadmutting attachment t'ci' sewing machines consisting of a plate constructed to be secured upcn the shuttle min of a sewing mcchine and provided with needle openings adjacent its respective ends. one end of the plate being reduced on its underside to form an overhanging lip and provided in said lip with a transversely disposed notch, the Walls of which form cutting edges and the other end'ot the plate being recessed, and an arcuate tongue. secured to the edge (if the plate and conforming to said recess, the lower edge of the tongue 'Eeiming a. cutting edge.

In testimony whtnreot I affix my signature.

SAM CORTESE. in st 

